from langchain_community.document_loaders import (
    TextLoader,         #文本加载
    PyPDFLoader,        # PDF
    Docx2txtLoader,     # Word
    UnstructuredHTMLLoader, # HTML
    CSVLoader,          # CSV
    JSONLoader,         # JSON
    SeleniumURLLoader,  # 动态网页
    WebBaseLoader       #网页加载
)